(多选题)30: 天然产物化合物库包括：
A: 糖类
B: 甾体类
C: 萜类
D: 维生素类
E: 前列腺素类
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1.(单选题)—Hi,I'mMelindaSmith,thenewsecretary.Nicetomeetyouhere. —Hi,I'mMikeBr...
1.(单选题)—Hello,I'mDavidChen.Nicetomeetyou. —. A.Are you B.Nice to meet you t...
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